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How to machine plane Cupping on timber boards

Woodworking machinery used: Planner Thicknesser

This can be done in a similar way to bowing and winding using the thicknesser, with the support this time holding the board up length ways.

An alternative that seems to work is:

1. With the convex side up, take gentle passes through the thicknesser until a strip approximately half the full width is flattened.

2. Now flip it over so the concave side is facing up and do the same.

3. From here until you have the right thickness keep on flipping it over.

By flipping it once you have a flat area, the problem of the thicknesser rollers pressing it flat is reduced.


That covers the basics, any compound problems can be tackled with combinations of the techniques. Use accurately set woodworking machinery in combination with simple flat straight jigs.

If you fancy a practice job, try making a “Jenga” set, see what difference it makes to the stability of towers when you change the moisture content.




Timber / wood for DIY, Woodworking, Joinery, Carpentry

Examples of joinery jobs, softwood types and timber grades

Carpentry and joinery softwood types

Timber Grades, Unsorted ? Vth's ? Sawfalling ?

Timber rough sawn ? PSE ? PAR?

Commonly available rough sawn and PSE / PAR timber sizes

How to choose a Timber Merchant / Supplier

Work out what timber you need for the job

Inspecting wood at the Timber Merchant

Preparing the timber for acclimatising

Planing timber / wood flat, square and true

How to plane up the good pieces of wood

How to plane "diamond" pieces

How to plane Winding or Twisted timber

How to plane bowing on a timber board

How to plane cupped or cupping timber